V4L/DVB (6698): pvrusb2: Implement signal routing schemes
The exact routing of video and audio signals within a device is a
device-specific attribute. Hauppauge devices do it one way; other
types of device may route things differently. Unfortunately it is
rather impractical to define chip-specific routing at the device
attribute level, so instead what happens here is that "schemes" are
defined. Each chip level interface implements its part of a given
scheme and the scheme as a whole is made into a device specific
attribute controlled via a table entry in pvrusb2-devattr.c. The only
scheme defined here is for Hauppauge devices, but clearly this opens
the door for other possibilities to follow.
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/pvrusb2/pvrusb2-devattr.h b/drivers/media/video/pvrusb2/pvrusb2-devattr.h
index f63c3dd..05eb2c66 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-devattr.h
+++ b/drivers/media/video/pvrusb2/pvrusb2-devattr.h
@@ -35,6 +35,7 @@
unsigned int cnt;
};
+#define PVR2_ROUTING_SCHEME_HAUPPAUGE 0
/* This describes a particular hardware type (except for the USB device ID
which must live in a separate structure due to environmental
@@ -55,6 +56,14 @@
was initialized from internal ROM. */
struct pvr2_string_table fx2_firmware;
+ /* Signal routing scheme used by device, contains one of
+ PVR2_ROUTING_SCHEME_XXX. Schemes have to be defined as we
+ encounter them. This is an arbitrary integer scheme id; its
+ meaning is contained entirely within the driver and is
+ interpreted by logic which must send commands to the chip-level
+ drivers (search for things which touch this field). */
+ unsigned int signal_routing_scheme;
+
/* V4L tuner type ID to use with this device (only used if the
driver could not discover the type any other way). */
int default_tuner_type;